(7) the carbon-oxygen cycle illustrates how
a) herbivores give off oxygen
b) producers give off oxygen
c) all organisms give off carbon dioxide
d) both b and c

(8) when animals excrete urea, which type of organism is responsible for converting this waste into a form that is usable by plants?
a) decomposers
b) lichens
c) climax community
d) saprophytes

hello there your anwers to these two are

7)D

8)A

i hope this helps you out

have a great evening

FaithRawlins14

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.